Core drill



.lubr 23, 1929.

J. T. PHIPPS AL GORE DRILL Filed Nov. 17, 1924 2 Sheets-Sheet ""N ...unllllllllilllll III Illlllll l.

TTOENEY July 23, 1929. J. r. Pl-nPPs l-:T AL

GORE DRILL Filed Nov. 17, 1924 l 2 Sheets-Sheet Pautejnterl July 2.3,1929.

l'UNITED STATES 1,721,921 PATE-Nr OFFICE.

rome a'. rams im naam c. sin'rn, or w'nrr'rinn, cnrronmn-g sam 'rennaisAssxeNoa ro sm smrn.

conn DRILL.

Our present invention is a' core drill; and it is an especial object ofthis linvention to provide acore drill utilizing the well knownadvantages of a disc bit.

l It is a further object of this invention to provide a core drill havinAample and eiiicient means for the delivery of a circulating fluid tothe cutting or the like.

It isa further o ject of this invention to lo provide a drill compris atoothed annulus eiiiciently (zo-operating with a pairof rotatable discsin the cutting of a core.

It is a further object of this invention to l provide a d-rill bitcomprising a pair of disc cutters supported from a hollow body by atubular nec and it is an especial object of this invention to use saidtubular neck in the support of an annular cutter, or in the support of acore barrel, or in the support of both of the last mentioned elements insubstantial ali ent.

t is a further object of this invention to provide a disc drillcomprising a hollow body threaded at its upper end for connection with adrill pipe, or the like, and provided also with means for so supportinga, core barrel that the latter may extend into said drill pipe, saidbody being preferably sectional and provided with a central bore ofsuilicient diameter to permit the downward movement of a circulati'nguid past said barrel and toward openf iigs, which may be below the lowerend there- It is a further object of this invention to provide a corebit comprising cutting discs and a toothed annular cutter, said annularcutter terminating in substantially the same horizontal lane or in alower plane than said discs, and eing preferably so constructed as tsthrow its chips towardthe path of 'said It is a further object of thisinvention to provide improved means, which may include liardenednuts'serving also as bearings, for the rotatable support and removableretention of cutting discs upon a drill body.

Other objects of our invention will appear v from the followingdescription vof an advantageous embodiment thereof taken in connectionwith the appended claims and the accompanying drawings, in which Fig. 1is a vertical longitudinal section.

Fig. 2 is a bottom plan view.

. Fig. 3 is a cross section on the line 3-3 of Fig. 1.

er end of the neck 17. This cutter may, hov'- ever, be inte al with neck17.

- l Fig. 4 is a cross section on the line of Fig. 6 shows, on a largerscale and in'verco tical section, an alternative form whichmay besuperior in some respects to that illustrated in the preceding figures.

. is a bottom plan viewand Fig. 8 is a side view of the last mentionedform; and Fig. 9 is a horizontal section on the line 9'9 of Fig. 6.

Re erring to the details of that vspecific embodiment-of our inventionchosen for purposes of illustration (Figs. 2 and 1- being drawn upon aslightly enlarged scale), 11 and 12 maybe respectively the upper andlower sections of a hollow and sectional drill body, these sectionsbeing shown as connected by a pin 13 and a box 14, which may be of usualcharacter, facilitatin the vconnection and separation thereof at wi andthe upper end of the upper section 11 may be provided at 15 with aninterior thread adapted to receive the threaded end of a section ofdrill `pipe 16, or the like.

. rlhe lower end of the lower section 12 may be provided with a hollowneck 17, shown as carrying, in substantial alignment, a core barrel 18,having a threaded connection therewith at 19, and shown as carryingalso, in a reduced portion thereof, a tubular cutter 20, externallythreaded at 21 and provided with shoulders 22, adapted to contact withthe low- The interior of the annular cutter 20 may be, and preferablyis, of slightly less diameter than the interior of either the neck 17 orthe core barrel 18, in order to avoid frictional contact upon anupstanding core, as the same enters and rises relatively to thementioned parts; and the teeth of the cutter 20 may advantageously beinclined, as best shown in Fig. 2, in such manner that the cuttingsformed thereby may be removed from contact with the mentioned core andforced outwardly toward the path of a pair of rotatabli cutting discs23, also' supported from said nec l Althou h the discs 23, or theirequivalent, may be o any usual or preferred character, I have shown thesame as provided with substantially lat inner faces and withsubstantially conical outer faces, and as extending downwardly tosubstantially the same hori- In the alternative form shown in 6,

zontal lever as, orto a lower level than the teeth of theannular cutter20. We may mount the discs 23, or their exluivalent, in any preferredmanner, but we as rotatable on and retained by'nuts 24, these nuts beininteriorly threaded for engagement wit exterior threads upon integralstuds or projections 25, extendin from the neck 17, near the lower endthereo and each of the nuts 24, these being cup shaped in general form,is preferabl provided not only with an annular pro]ecting shoulder 26adapted to contact with the outer surface o a disc 23 or with an annulardepression 27 therein, but also with an element, as a screw 28,constituting removable means for preventing accidental unscrewing anddisengagement thereof. Obviously, the threads within the nuts 24,(.which may be characterized as cap nuts serving also asbearings, thesenuts ber .ingaccordingly best formed of acomparatively hard material)should be of such direction that the rotation of the mentioned discsthereon during the cuttin operation of our I drill may tend rather totig ten than to loosen said nuts. It is an advantage of these nuts thatthey serve as readily replaceable bearings; and the describedconstruction 1s such as to permit the countersinking of sald nuts, toany desired degree, without corresponding l loss of bearing surface.

The up r end of the core barrel 18, or its equiv ent, may be providedwith a valve of any preferred type, to prevent the downward entrance ofa circulating mud or'other fluid therethrough; and we have shown thebarrel 18 as snrmounted by a fitting 37 having -threaded engagementtherewith at 38 "and serving as a cage fora ball 29. The up er surface,or any suitable surface of the fitting 37 may be apertured, as at 30, soas to permit an escape of air or other fluid initially present withinthe barrel 18; and the fitting 18 may also be provided with an interiorannular ring or projection 31, cooperating in theretention of a seat 32upon which the all 29 would normally rest.

In order to permit a free circulation of mud or water, or the like, tofacilitate the operation of the described cutting elements, and toremove the cuttings formed thereb y, the respective sections 11 and12-of .the b y or outer barrel of my drill may be respectively provided,as at 33, 33', with a central longitudinal bore or bores of sufficientdiameter to permit a free downward `movement of any desired iiuid, thebore 33 being shown as connected, byA lateral passages 34, with inclineddelivery passages 35 which may terminate below the lower. en of thelower barrel 18j-n such manner as to assure a prompt removal'of cuttingssuch as ma A be formed by the annular cutter 20 and the dsiscs 23,' ortheir equivalents. Y

ave shown the same this Vbeing an especially advanta ous embodiment ofmy invention, it will noticed that thediscs 23 are set lat a slightinclination, as by cuttin or otherwiseprovidin convergent flat sur acesat 39 and 39', whic surfaces may represent a taper of, for example, 11,@inch to the foot; and the teeth 20 may be formed integral with the neck17 and may be permitted initially to project to a somewhat lower levelthan said discs. The convergent flat surfaces 39 and 39 ma if desired,actually encroach upon the thic f ness of the metal at the bases of theadjacent teeth, in order'to enable the relatively\mov ing parts referredto to co-operate effectively, without leaving any intervening ring ofuncut rock; and the bases of the teeth may be appreciably thicker thanthe tops thereof whether or not the respective edgesof teeth arerelatively inclined in the advantageous manner shown. In this form of myinvention we have also shown the bea nuts 24:. as provided with a simpleand'lg fective pin-and-slot means for preventing undesired relativerotation of these parts,

this means tending to obviate all necessity for giving the screw 28 aneccentric position.

N ot only the bearing nuts above mentioned but the cutting and bearingportions of the discs described,and optionally also the teeth by whichthe core is cut, may be formed of a special Vsteel or steels, orhardened suitably to `the exacting requirements of the indicated uses.

Although we have herein described two alternative embodiments of ourinvention, it will be understood that various features and that alsovarious modifications m1 ht be made, by those skilled in the art to whicthis case relates, without the slightest departure from the spirit andscope of our invention, as the same is indicated above and in thefollowing claims.

We claim as our invention:

, 1. A disc drill bit comprising a hollow body its reception by a drillstring, and upwardlyl provided with internal means for receivin acorebarrel; a tubular cutter downwar y mounted in coaxial alignment on saidneck member; laterally projecting studs downwardl formed on said neckmember and rotata le cutting discs mounted on sa'd projecting studs. A i

3. A drill bit comprising: a body .I thereof might be independentlyemployed,

jectin studs, said neck 4formin an annular 10 shoul er externallshoulder having therethrough.

In testimony whereof, we have hereunto on said bo y, and said uidcirculating passages set our hands at Los Angeles, California, this 158th day of November 1924.

n JoIN '.r. PHIPPS.

HERMAN C. SMITH.

